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// Copyright 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "cc/animation/scrollbar_animation_controller_linear_fade.h"
#include "base/time/time.h"
#include "cc/layers/layer_impl.h"
#include "cc/layers/scrollbar_layer_impl_base.h"
namespace cc {
scoped_ptr<ScrollbarAnimationControllerLinearFade>
ScrollbarAnimationControllerLinearFade::Create(LayerImpl* scroll_layer,
base::TimeDelta fadeout_delay,
base::TimeDelta fadeout_length) {
return make_scoped_ptr(new ScrollbarAnimationControllerLinearFade(
scroll_layer, fadeout_delay, fadeout_length));
}
ScrollbarAnimationControllerLinearFade::ScrollbarAnimationControllerLinearFade(
LayerImpl* scroll_layer,
base::TimeDelta fadeout_delay,
base::TimeDelta fadeout_length)
: ScrollbarAnimationController(),
scroll_layer_(scroll_layer),
scroll_gesture_in_progress_(false),
scroll_gesture_has_scrolled_(false),
fadeout_delay_(fadeout_delay),
fadeout_length_(fadeout_length) {}
ScrollbarAnimationControllerLinearFade::
~ScrollbarAnimationControllerLinearFade() {}
bool ScrollbarAnimationControllerLinearFade::IsAnimating() const {
return !last_awaken_time_.is_null();
}
base::TimeDelta ScrollbarAnimationControllerLinearFade::DelayBeforeStart(
base::TimeTicks now) const {
if (now > last_awaken_time_ + fadeout_delay_)
return base::TimeDelta();
return fadeout_delay_ - (now - last_awaken_time_);
}
bool ScrollbarAnimationControllerLinearFade::Animate(base::TimeTicks now) {
float opacity = OpacityAtTime(now);
ApplyOpacityToScrollbars(opacity);
if (!opacity)
last_awaken_time_ = base::TimeTicks();
return IsAnimating() && DelayBeforeStart(now) == base::TimeDelta();
}
void ScrollbarAnimationControllerLinearFade::DidScrollGestureBegin() {
scroll_gesture_in_progress_ = true;
scroll_gesture_has_scrolled_ = false;
}
void ScrollbarAnimationControllerLinearFade::DidScrollGestureEnd(
base::TimeTicks now) {
// The animation should not be triggered if no scrolling has occurred.
if (scroll_gesture_has_scrolled_)
last_awaken_time_ = now;
scroll_gesture_has_scrolled_ = false;
scroll_gesture_in_progress_ = false;
}
void ScrollbarAnimationControllerLinearFade::DidMouseMoveOffScrollbar(
base::TimeTicks now) {
// Ignore mouse move events.
}
bool ScrollbarAnimationControllerLinearFade::DidScrollUpdate(
base::TimeTicks now) {
ApplyOpacityToScrollbars(1.0f);
// The animation should only be activated if the scroll updated occurred
// programatically, outside the scope of a scroll gesture.
if (scroll_gesture_in_progress_) {
last_awaken_time_ = base::TimeTicks();
scroll_gesture_has_scrolled_ = true;
return false;
}
last_awaken_time_ = now;
return true;
}
bool ScrollbarAnimationControllerLinearFade::DidMouseMoveNear(
base::TimeTicks now, float distance) {
// Ignore mouse move events.
return false;
}
float ScrollbarAnimationControllerLinearFade::OpacityAtTime(
base::TimeTicks now) {
if (scroll_gesture_has_scrolled_)
return 1.0f;
if (last_awaken_time_.is_null())
return 0.0f;
base::TimeDelta delta = now - last_awaken_time_;
if (delta <= fadeout_delay_)
return 1.0f;
if (delta < fadeout_delay_ + fadeout_length_) {
return (fadeout_delay_ + fadeout_length_ - delta).InSecondsF() /
fadeout_length_.InSecondsF();
}
return 0.0f;
}
void ScrollbarAnimationControllerLinearFade::ApplyOpacityToScrollbars(
float opacity) {
ScrollbarLayerImplBase* horizontal_scrollbar =
scroll_layer_->horizontal_scrollbar_layer();
if (horizontal_scrollbar)
horizontal_scrollbar->SetOpacity(opacity);
ScrollbarLayerImplBase* vertical_scrollbar =
scroll_layer_->vertical_scrollbar_layer();
if (vertical_scrollbar)
vertical_scrollbar->SetOpacity(opacity);
}
} // namespace cc
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